package com.heima.app.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;

import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

public class AuthorizeFilter implements Ordered, GlobalFilter {
    /**
     * 此为网关的过滤器,负责校验token
     * 1.取token(非空)
     * 2.验证(是否一致)(是否过期)
     * 3.放行
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
       //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        // 2.判断请求是否登录(登录页面放行)
        if (request.getURI().getPath().contains("/login")) {
            //放行
            return chain.filter(exchange);
        }
        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //5.判断token是否有效
            //是否过期
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        int result = AppJwtUtil.verifyToken(claimsBody);
        if(result ==1||result==2){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }


        //6.放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
